FiChai

Buy from any supermarket that has the cheapest price at that time, which chopped into pieces. Go home, rinse them with tap water briefly and cook in different but simple ways such as shabu and steamed. The possible biggest you can get at a supermarket won't be as big as the ones sold in restaurants, maybe only up to 7+/- lbs, but already good enough for 2 people for at least 1-2 meals with side dishes.